The Bachmann On30 Heisler appropriately does not come with directional lighting enabled. The lamps on the model appear to be carbide-fueled type. Directional lighting would require the crew to go back and forth extinguishing and igniting the lamps every time the direction of the locomotive changed. Thus once ignited lamps would remain lit.

I also notice that in the stock configuration, there is no dynamo sound, as there is on button #5 for other locos. Would this be because the lights weren't electrical? If so, can this be changed, maybe at CV 39, set at 00 by default?